<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        html, body {
            margin: 0;
            padding: 0;
            overflow: hidden;
            height: 100%;
        }
        #container{
            width: 100vw;
            height: 100vh;
            display: flex;
            background: white;
            justify-content: center;
            align-items: center;
        }
    </style>
</head>
<body>
    <div id="container">
        <div class="error">网络异常</div>
    </div>
</body>
</html>